Subsequent Events	6 Months Ended
Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	O. Subsequent Events On June 26, 2019, management of the Aluminerie de Bécancour Inc. (ABI) smelter in Québec, Canada presented a final offer to the United Steelworkers for a new six-year labor agreement. The smelter, which is owned by Alcoa Corporation (74.95%) and Rio Tinto Alcan Inc. (25.05%), had been operating at reduced capacity since January 11, 2018 after union members rejected a proposed labor contract for hourly employees. On July 2, 2019, members of the United Steelworkers union in Québec approved the agreement and ABI announced a plan to begin the restart process on July 26, 2019. A recall of the approximately 900 unionized employees who had been on lockout will be completed in accordance with a specific back-to-work protocol, with those on lockout generally being recalled within eight months of the July 26, 2019 restart process commencement. The restart process is expected to be completed within the second quarter of 2020. The Company expects to record charges associated with the restart of approximately $40 to $50 (approximately $30 to $35 after-tax), each in the second half of 2019 and in the first half of 2020. In January 2019, Alcoa Corporation reached an agreement with the workers’ representatives at the Avilés and La Coruña (Spain) aluminum facilities as part of the collective dismissal process announced in October 2018 and curtailed the smelters at these two locations in February 2019. As part of the agreement, the Company agreed to conduct a sale process to identify third parties with interest in acquiring the facilities and maintain the smelters in restart condition up to June 30, 2019. Through the sale process, PARTER, a private equity investment firm, was identified as a potential buyer for both of the Spanish facilities, inclusive of the smelters and casthouses at both facilities and the paste plant at La Coruña. Prior to the June 30, 2019 deadline, Alcoa Corporation agreed with the workers’ representatives to extend the timeline for the potential buyer to meet the financial conditions of a draft share purchase agreement by one week. On July 5, 2019, Alcoa Corporation signed a conditional share purchase agreement with PARTER for the purchase of these two facilities. The agreement was subject to PARTER meeting certain financial conditions prior to July 31, 2019 to support future operations. Prior to signing the conditional share purchase agreement with PARTER, Alcoa Corporation reached agreement with the workers’ representatives related to the potential transaction. If PARTER was not able to meet the financial conditions prior to July 31, 2019, the Company would have proceeded with the collective dismissal and social plan as of August 1, 2019. As of July 31, 2019, PARTER was able to meet the financial conditions and the transaction has closed. Alcoa Corporation will record restructuring-related charges of approximately $135 in the third quarter of 2019 resulting from a cash contribution of $95 to PARTER per the agreement and a charge of approximately $40 to meet a working capital commitment and write-off of the remaining net book value of plants’ assets.

Subsequent Events

6 Months Ended

Jun. 30, 2019

O. Subsequent Events

On June 26, 2019, management of the Aluminerie de Bécancour Inc. (ABI) smelter in Québec, Canada presented a final offer to the United Steelworkers for a new six-year labor agreement. The smelter, which is owned by Alcoa Corporation (74.95%) and Rio Tinto Alcan Inc. (25.05%), had been operating at reduced capacity since January 11, 2018 after union members rejected a proposed labor contract for hourly employees. On July 2, 2019, members of the United Steelworkers union in Québec approved the agreement and ABI announced a plan to begin the restart process on July 26, 2019. A recall of the approximately 900 unionized employees who had been on lockout will be completed in accordance with a specific back-to-work protocol, with those on lockout generally being recalled within eight months of the July 26, 2019 restart process commencement. The restart process is expected to be completed within the second quarter of 2020. The Company expects to record charges associated with the restart of approximately $40 to $50 (approximately $30 to $35 after-tax), each in the second half of 2019 and in the first half of 2020.

In January 2019, Alcoa Corporation reached an agreement with the workers’ representatives at the Avilés and La Coruña (Spain) aluminum facilities as part of the collective dismissal process announced in October 2018 and curtailed the smelters at these two locations in February 2019. As part of the agreement, the Company agreed to conduct a sale process to identify third parties with interest in acquiring the facilities and maintain the smelters in restart condition up to June 30, 2019. Through the sale process, PARTER, a private equity investment firm, was identified as a potential buyer for both of the Spanish facilities, inclusive of the smelters and casthouses at both facilities and the paste plant at La Coruña. Prior to the June 30, 2019 deadline, Alcoa Corporation agreed with the workers’ representatives to extend the timeline for the potential buyer to meet the financial conditions of a draft share purchase agreement by one week. On July 5, 2019, Alcoa Corporation signed a conditional share purchase agreement with PARTER for the purchase of these two facilities. The agreement was subject to PARTER meeting certain financial conditions prior to July 31, 2019 to support future operations. Prior to signing the conditional share purchase agreement with PARTER, Alcoa Corporation reached agreement with the workers’ representatives related to the potential transaction. If PARTER was not able to meet the financial

conditions prior to July 31, 2019, the Company would have proceeded with the collective dismissal and social plan as of August 1, 2019.

As of July 31, 2019, PARTER was able to meet the financial conditions and the transaction has closed. Alcoa Corporation will record restructuring-related charges of approximately $135 in the third quarter of 2019 resulting from a cash contribution of $95 to PARTER per the agreement and a charge of approximately $40 to meet a working capital commitment and write-off of the remaining net book value of plants’ assets.